我找到了将类转换为字典的通用方法，是否有通用的方法来反转该过程？

Question

所以我正在尝试在Swift中构建数据映射器样式的ORM。我试图找到一种方法将任何实体转换为字典，以便我可以将其映射到数据库表。我设法用这段代码做到了：

现在我可以做到：

public protocol Entity: class {
    var id: Int? { get set }
}

func unwrap(any:Any) -> Any? {
    let mi = Mirror(reflecting: any)

    if mi.displayStyle != .Optional {
        return any
    }

    if mi.children.count == 0 {
        return nil
    }

    let (_, some) = mi.children.first!

    return some
}

public func serialize<T: Entity>(entity: T) -> [String:String] {
    let aMirror = Mirror(reflecting: entity)
    var dict = [String:String]()

    for child in aMirror.children {
        if let label = child.label where !label.hasPrefix("_") {
            switch unwrap(child.value) {
            case let entity as Entity:
                if let id = entity.id {
                    dict[label] = String(id)
                }
            case let .Some(test):
                dict[label] = String(test)
            default: break
            }
        }
    }

    return dict
}

public class User: Entity {
    public var id: Int?
    var username: String
    var password: String
    var role: UserRole?

    public init(username: String, password: String) {
        self.username = username
        self.password = password
    }

    public func assignRole(role: UserRole) {
        self.role = role
    }
}

public class UserRole: Entity {
    public var id: Int?
    var name: String
    var description: String

    public init(name: String, description: String) {
        self.name = name
        self.description = description
    }
}

将打印：let newUser = User(username: "NotMyRealName", password: "SomeKindOfPassword") let adminRole = UserRole(name: "admin", description: "Administrator of the website") adminRole.id = 1 newUser.assignRole(adminRole) print(serialize(newUser))

这一切都很好，但现在我想扭转这个过程。

我想编写一个可以这样使用的函数：

["password": "SomeKindOfPassword", "role": "1", "username": "NotMyRealName"]

你能想到吗？我知道如果我试图绕过init方法可能会有点麻烦，但我想尝试一下。